It's bad voice acting because it sounds like a terrible anime dub.

I almost never like Japanese voices.

FF has always had good English voice acting.
The problem isn't as much their voices themselves.

I like English voices.

The problem is they put the wrong emphasis on everything they're saying and absolutely nothin sounds natural.

Good VAs will actively act out their part in the studio while they're recording.

These people just sound like they're standing In front of a mic twiddling their thumbs.